| HDD Maldon Limited | Construction | 2017 |
| HDD Mickleover Limited | Construction | 2020 |
| HDD Newport Pagnell Limited | Construction | 2019 |
| HDD Nuneaton Limited | Construction | 2024 |
| HDD Sherford Limited | Construction | 2019 |
| HDD Tattenhoe Limited | Construction | 2023 |
| HDP Local Ltd | Hospitality | 2022 |
| HDP Midlands Pubs Limited | Hospitality | 2023 |
| HDR Printers Ltd | Manufacturing | 2006 |
| HE Consultancy Services Ltd | Professional & scientific | 2021 |
| HE Radiology Ltd | Health & social care | 2025 |
| Head Start Driving Academy Ltd | Education | 2026 |
| Headds UP Equestrian Ltd | Arts & recreation | 2022 |
| Headhunter Services Ltd | Professional & scientific | 2025 |
| Heading Lift Solutions Ltd | Construction | 2020 |
| Heading OUT Hair Salon Limited | Other services | 2014 |
| Headington Auto Centre Limited | Wholesale & retail | 2008 |
| Heads in Harmony CIC | Arts & recreation | 2025 |
| Headstrong Corporation Ltd | Real estate | 2021 |
| Headstrong Styling Limited | Other services | 2020 |
| Headsup Consultants Limited | Hospitality | 2016 |
| Headvheart Ltd | Professional & scientific | 2017 |
| Headway (Nottingham) Limited | Health & social care | 2001 |
| Headway - the Brain Injury Association | Health & social care | 1989 |
| Headway Retail Limited | Wholesale & retail | 1994 |
| Headway South West London Limited | Health & social care | 2012 |
| Headzpace Therapeutic Care Limited | Health & social care | 2020 |
| Healing of the Nation LP | | 2019 |
| Healing Touches Ltd | Health & social care | 2024 |
| Health and Safety Technology and Management Limited | Professional & scientific | 1983 |
| Health Care Active Ltd | Professional & scientific | 2021 |
| Health Connec Partner Recruitment Ltd | Administrative & support | 2021 |
| Health First Everything Next Ltd | Public administration | 2016 |
| Health GAP CIC | Health & social care | 2026 |
| Health Harmony Limited | Health & social care | 2022 |
| Health Hub Twenty Four Ltd | Health & social care | 2018 |
| Health in Menopause Limited | Health & social care | 2019 |
| Health Management IQ Ltd | Information & communication | 2025 |
| Health Mapping Ltd | Health & social care | 2020 |
| Health Rejuvenation Ltd | Financial services | 2025 |
| Health Team Limited | Health & social care | 2006 |
| Health Treatment Ltd | Other services | 2024 |
| Health-Chem Limited | Health & social care | 2011 |
| HEALTH360 Limited | Public administration | 2024 |
| Healthcare 3K Limited | Health & social care | 2020 |
| Healthcare Print and Packaging Limited | Manufacturing | 2008 |
| Healthcore Ltd | Professional & scientific | 2025 |
| Healthis Desa Limited | Wholesale & retail | 2020 |
| Healthmade Limited | Health & social care | 1994 |
| Healthmine Ltd | Health & social care | 2019 |
| Healthnest Pharma Limited | Wholesale & retail | 2024 |
| Healthy Air Technology Ltd | Wholesale & retail | 2018 |
| Healthy Eating Solutions Ltd | Health & social care | 2011 |
| Healthy Heartbeat Ltd | Health & social care | 2017 |
| Heanor Tool & Plant Hire Limited | Administrative & support | 2018 |
| Heanor Vision CIC | Other services | 2012 |
| Hear 2 Help Notts Ltd | Health & social care | 2024 |
| Hear ME QR Ltd | Information & communication | 2026 |
| Hearing IS Believing Ltd | Wholesale & retail | 2008 |
| Hearne Executive Search Ltd | Administrative & support | 2025 |
| Hearne Property Group Ltd | Real estate | 2025 |
| Hearst Homes Limited | Construction | 2015 |
| Heart & Sole Reflexology Clinic Ltd | Other services | 2020 |
| Heart & Soul Unbox Ltd | Manufacturing | 2019 |
| Heart and Hands Tuition LLP | | 2024 |
| Heart and Home Flooring Limited | Construction | 2025 |
| Heart Beauty Services Limited | Other services | 2023 |
| Heart Care International Ltd | Health & social care | 2024 |
| Heart Church | Other services | 2006 |
| Heart Homes Limited | Construction | 2001 |
| Heart Nails & Spa Limited | Other services | 2023 |
| Heart Preschool CIC | Administrative & support | 2017 |
| Heartapack Limited | Wholesale & retail | 2025 |
| Heartbridge Care Ltd | Health & social care | 2025 |
| Hearthfire Property Investments Ltd | Real estate | 2016 |
| Heartland Films Ltd | Information & communication | 2025 |
| Heartland Kennels Shardlow Limited | Other services | 2020 |
| HEARTS4PEOPLE Healthcare Services Ltd | Health & social care | 2021 |
| Heartway Homes Ltd | Real estate | 2026 |
| Heartwood Investments Limited | Agriculture & fishing | 2024 |
| Heaseldens Limited | Real estate | 2005 |
| Heasman Marketing Solutions Ltd | Professional & scientific | 2018 |
| Heat Exchange Limited | Construction | 1996 |
| Heat Holmes Limited | Professional & scientific | 2015 |
| Heat Light and Power (UK) Limited | Construction | 2012 |
| Heat UR Homes Ltd | Construction | 2023 |
| Heat-In Ltd | Construction | 2026 |
| Heateam East Midlands Limited | Construction | 2009 |
| Heatfields Heating and GAS Limited | Energy | 2026 |
| Heath Group Ltd | Real estate | 2023 |
| Heath Square Ltd | Construction | 2022 |
| Heathcoat Dining Limited | Hospitality | 2026 |
| Heather Jones Properties Limited | Real estate | 2024 |
| Heather View Developments Limited | Construction | 2021 |
| Heatherbrae Consulting Ltd | Professional & scientific | 2015 |
| Heatherin Therapeutic Services Ltd | Health & social care | 2024 |
| Heathertech Ltd | Professional & scientific | 2022 |
| Heathfield International 2 Limited | Administrative & support | 2025 |
| Heathfield International Ltd | Administrative & support | 2021 |
| Heathline Solutions Limited | Other services | 2024 |